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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 981 (Lighting Systems) >> Diagnostic Information and Procedures >> Backup Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect a test lamp between the relay side of the backup lamp fuse and ground.
  2. Ignition ON, verify that the test lamp turns on and off while commanding the backup lamps on and off with a scan tool.
    • If the test lamp does not turn on and off while changing between the commanded states, refer to the Backup Lamp Relay Control Circuit Test below.
  3. If 1 or both of the backup lamps do not turn on and off, refer to the Backup Lamp Circuit Test below.
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